[Xen-ia64-devel] [PATCH] prevent domU from mapping uncacheable memory

[Alex Williamson <alex.williamson@xxxxxx>]

   I ran across a problem with booting domUs on an sx1000 chipset based
system.  The interesting thing about these systems is that they do not
support uncached access to system memory.  When domU boots, there are
some I/O port space probes, this is what seems to be causing problems.
The lookup_domain_mpa() function returns a pte for pfn 0, to which
translate_domain_pte() applies the requested memory attributes.  This
allows the domU to access the page as uncachable, causing an MCA.

   The patch below avoids this by preventing non-dom0 domains from
adding memory attributes to ptes.  Anyone have a better solution?
Thanks,

        Alex

Signed-off-by: Alex Williamson <alex.williamson@xxxxxx>

Attachment: no_uncached_domu_ptes.patch
Description: Text Data

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